A starter-alternator is an electric machine that can operate either as a motor or as a generator. The starter-alternator may add positive torque to the crankshaft (accelerating) or negative torque (braking). In addition to it the starter-alternator provides power to the 42 V network of the car. The classical control strategy is voltage control. The new control strategy minimizes the fuel consumption and the emissions while maintains the SOC (State Of Charge) of the battery in a prescribed range. SOC is defined as the quotient of the energy stored in the battery to the energy stored at the normal state of charge. Model based predictive control was designed. The cost function is simulated about 80 sec in advance and the operation of the starter-alternator is optimized. During this period the speed of the car is assumed to be constant. Further on the efficiency of the battery and that of the electrical machine are assumed constant, as well. By means of simulations an improvement of about 2 to 7 % in fuel consumption could be shown with respect to the classical voltage control strategy. This relative improvement decreased as the load power increased.
Fuel consumption reduction with a starter-alternator using an MPC-based optimisation
Kraftstoffverbrauchsreduktion mit Hilfe einer prädiktiv geregelten Anlasser-Lichtmaschine
2003
6 Seiten, 5 Bilder, 6 Quellen
Conference paper
Storage medium
English
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